Charles disston



.f a, 09o 5, 1 .e v @with itstes @time CHARLES DISSTON, @F PHILADELPHIA, PENNSYLVANIA.

Letters Patent No. 63,486, dated April 2, 1867.

IMPROVEMENT IN SAWS.

TO ALL WHOM IT MAY CONCERN:

Be it known thztt I, CHARLES DISSTON, of Philadelphia, Pennsylvania, have invented certnin improvements in Saws with Detachable Teeth; and I do hereby declare the-following to be :t full, clear, and exact description of the some, reference being had to the vaccompanying drawing, :ind to the letters of reference marked thereon.

My invention consists in the mode described hereafter of securing detachable teeth to the blades of saws, whereby the necessity of the expensive litting and tedious manipulation required in other modes of attaching detachable teeth is obviuted.

Inorder to enable others skilled in the nrt to Ineke my invention, I will now proceed to describe the manner of constructing the sume. On reference to theuccompunying drawing, which for-ins u part of this specification- Figure l is e sectional view oi' port of e saw with a detiichnble tooth.

Figure 2, en exterior view, illustrating the mode of applying the tooth.

Figure 3, :t transverse section on the line 1-2, fig. I, drown to un enlarged scale.

Figure 4, :t Inodiliczttion; and

Figure 5, a transverse section on the line 3-4, iig. d, drown to :1n-enlarged seele.

Similar letters refer to similar parts throughoutv the several views.

A represents port of the bludeof n circuler or other sow, to which the teeth `have to be secured, and B is one ofthe teeth, .which consists of the cutting projection a, the curved projection Z7, und the circuler projection el. In the edge of the-projection d is c recessrx, which is enlarged :tt the inner end, csshown in Iig. 4, this enlarged portion being countersunh on both sides for at purpose described hereafter. The blade of the sew is placed on the bed of :in ordinary drillingmochine, and holes corresponding in number and position to the teeth required ure drilled in the blade so near the edge that the drillshell project beyond the letter, the edge of the hole being thus only the segment of :L circle. Iy asuiteble tool in the same drilling machine it grooveris formed in the edge of each hole to receive V-sheiped lips, 2.' e', on thdcdgo ot' the circuler projection d of the tooth, this projection being:r otv exnctly'the same diameter as the hole in the binde of' the sew,l measured on the outer surface ofthe same. In the edge of eatclrhole are cut reccsses,':v and m, there being :ts many of the latter as there are lips on the projectionia?, so thut'when the tooth in the position shown'in iig. 2, it may be litted laterally to the hole, the lips passing into the seid recesses `1n. After tile circuler projection, e7, of the tooth hu-s been thuspluced in the hole, thetooth is drawn-beck to the position shown in g. I, so that its curved projection, Z1, muy be brought to bear against the rounded portiorhf, of the` binde, the recess x being brought opposite the recess I", und the V-shaped lips t' taking their places in the V-shnped groove in the edge of theholein the blu-de, to which the tooth is now confined. Additional lateral security is tti'orded by making the under side et' the curved projection, b, V-shnped, 'to correspond to ai'V-shztped groove in the rounded portion,f, of the binde. After the tooth has been thus fitted end conined tol the blode,t't metal block or rivet, i, which will t accurately thel two openings a: rv is inserted in the lutter, and the portion fitting thefenlurged end ot' the opening a: is riveted on both sides, so that the block is contincdjrinly in its place, and the tooth is prevented from turning without the necessity of inserting` n rivet iny the sew-blade. In place of the block or rivet infn smell hole muy be drilled partly in the eilige of the tooth and partly in the edge of the hole in the blade, this hole being countersnnk on both sides, so that u rivet, h', may be fitted in it without projecting above the surface of the saw. 1Bhe tooth is new I perfectly secure, but con be removed readily after withdrawing the rivet and forcing the tooth forward to the position shown in iig. 2.

The itbove-described mode ot'securing detachable teethto saws possesses the greet advantage of demanding much less tedious manipulation in fitting the teeth than other modes heretofore used, in which the recesses in the blades for receiving the teeth ure bounded by straight edges or in part only by curved or rounded edges. This advantage will be readily understood by those familier with the ease and accuracy with which the simple operation of drilling-is accomplished, and with'the perfect appliances which ureuscd in modern machine shops,

The lips 't' muy be on the edge of the opening iu the blade, und recesses und grooves may be made in the odge of the projection d. v

, I de not claim a sew tooth having its bese formed on a circuler line and tting a recess in the sew-blade,

but I claim es my invention, and desire to secure by Letters Patent- The lips z'on the edge of the projection d of :t sow tooth or on the edge oi' n recess in the blade, in coinbination with n. groove, and recesses m inthe projection or in the blude, suhstitntinily :is specified.

In testimony whereof I have signed my name to this specification in the presence ol" two subscribing witnesses.

` enne. DissroN.

Witnesses:

Guss. E. FOSTER, W. J. R, DELANY. 

